FUEL CELL SYSTEM

To provide a fuel cell system configured to reduce the drying of the inside of the fuel cell stack and increase the power generation performance of the fuel cell stack by reducing a circulation gas flow rate during high temperature operation. Disclosed is a fuel cell system comprising: a fuel cell stack, an ejector, a first injector which supplies fuel gas to the ejector, a second injector which has a smaller fuel gas injection amount than the first injector and which supplies the fuel gas to the ejector, a third injector which supplies the fuel gas to fuel electrodes of the fuel cell stack, a fuel gas supplier, a first supply flow path, a second supply flow path which enables the supply of the fuel gas from the third injector to the fuel electrodes of the fuel cell stack, a circulation flow path, a temperature detector, and a controller.